Members may post memos of up to 140 characters. Those wanting to see all of someone’s thoughts can sign up as a “follower.”

To brighten up the product, Twitter recently added pictures to the user’s feed, formerly only text.

None of this cleans up Twitter’s growing reputation as a hideout for creeps, many specializing in hatred of females.

In a celebrated case last summer, three British women – a classics professor, a member of Parliament and a feminist advocate – came under primitive assault for urging the Bank of England to put the image of the mannerly writer Jane Austen on some banknotes.

They were assailed with the usual insults and unpublishable allusions to body parts.

But some tweets called for rape and painful death, threats serious enough to bring in police.

Several men were arrested, ranging from a military instructor to an unemployed shut-in living with his girlfriend.

Twitter has responded by creating a “Report Tweet” button to flag a troubling tweet for review.

That may deter death threats, but what good will it do for the pervasive lower-fever ugliness?

It does nothing about impersonators or “concern trolls,” a special breed of pest that does mischief pretending affinity for the target.

A concern troll might write, “Who can blame Susan Rice for flaunting her superb figure in a fitted black suit?”

You can’t call the social-media police on that, even if there were a social-media police.

The best defense, some say, is to ignore the trolls. “Don’t Feed the Trolls” may be sound advice for those who consider Twitter worth the affronts.

But really, no one has to be on Twitter. So you wonder how the site’s numbers can grow if it’s become a protected playground for sickos.

Such websites are private property. They can set rules on who may enter their living rooms.

The rules may leave room for a wide range of controversial opinion, but the owner decides.

But about 85 percent of the nastiest stuff (my number, plucked from the air) would simply disappear if participants had to attach their real identities to their words.